Observation of irregularities dynamics by vertical and quasi-vertical sounding

Based on comparative analysis of the A and H plots collected from the ionograms of vertical and quasi vertical sounding you can get information about spatial and temporal changes. The ionosonde sensitivity to irregularities ΔN / N ~5*10, sensing period 1 minute, distance between ionosondes 30 km. It is allows to investigate fast-flowing (with periods of 5-20 min) and small-scale irregularities of the ionosphere.